yes, that's because you don't have a pristine precise sources.list (ie no more than main, universe, multiverse, & restricted from precise, precise-updates, and precise-security; no ppas or backports).
apt-get source virtualbox=4.1.12-dfsg-2ubuntu0.6 apt-get build-dep virtualbox=4.1.12-dfsg-2ubuntu0.6
i did make a mistake earlier in saying "apt-get install build-dep", but a quick trip to the apt-get man page would have straightened a person out.
yes, that's because you don't have a pristine precise sources.list (ie no more than main, universe, multiverse, & restricted from precise, precise-updates, and precise-security; no ppas or backports).
apt-get source virtualbox= 4.1.12- dfsg-2ubuntu0. 6 4.1.12- dfsg-2ubuntu0. 6
apt-get build-dep virtualbox=
i did make a mistake earlier in saying "apt-get install build-dep", but a quick trip to the apt-get man page would have straightened a person out.